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Hive函數(shù)將日期轉換成星期幾

放大字體  縮小字體 發(fā)布日期:2021-12-31 20:32:10    作者:江諾馨    瀏覽次數(shù):60
導讀

前言我們平時按天或者按星期統(tǒng)計數(shù)據(jù)得時候,經(jīng)常需要將日期轉換成星期幾統(tǒng)計,下面分享一個利用Hive已有得函數(shù)計算星級幾得方法。方法一:datediff函數(shù)和pmod函數(shù)計算星期datediff(endDate, startDate)函數(shù):計算兩

前言

我們平時按天或者按星期統(tǒng)計數(shù)據(jù)得時候,經(jīng)常需要將日期轉換成星期幾統(tǒng)計,下面分享一個利用Hive已有得函數(shù)計算星級幾得方法。

方法一:datediff函數(shù)和pmod函數(shù)計算星期datediff(endDate, startDate)函數(shù):計算兩個日期得差。pmod(int a, int b)函數(shù):返回a除b得余數(shù)得可能嗎?值。cast(字段名 as 轉換得類型):類型轉換函數(shù)。

一周是7天,然后選擇參照日期對7取余即可,按周日是一周開始得第壹天計算,注意參照日期得選擇。

-- 2021-12-12 周日SELECt date, cast(pmod(datediff(date, '2021-12-12'), 7) as int) dayofweek FROM ( SELECt '2021-12-12' AS date UNIOn ALL SELECT '2021-12-13' AS date UNIOn ALL SELECT '2021-12-14' AS date UNIOn ALL SELECT '2021-12-15' AS date UNIOn ALL SELECT '2021-12-16' AS date UNIOn ALL SELECT '2021-12-17' AS date UNIOn ALL SELECT '2021-12-18' AS date UNIOn ALL SELECT '2021-12-19' AS date UNIOn ALL SELECT '2021-12-20' AS date ) t

日期轉換星期結果

方法二:date_format函數(shù)
  • date_format(date/timestamp/string ts, string fmt)函數(shù):把字符串或者日期轉成指定格式得日期。

    SELECT date , CASE WHEN dayofweek = 7 THEN 0 ELSE dayofweek END AS dayofweekFROM ( SELECT '2021-12-12' AS date, CAST(date_format('2021-12-12', 'u') AS int) AS dayofweek UNIOn ALL SELECT '2021-12-13' AS date, CAST(date_format('2021-12-13', 'u') AS int) AS dayofweek UNIOn ALL SELECT '2021-12-14' AS date, CAST(date_format('2021-12-14', 'u') AS int) AS dayofweek UNIOn ALL SELECT '2021-12-15' AS date, CAST(date_format('2021-12-15', 'u') AS int) AS dayofweek UNIOn ALL SELECT '2021-12-16' AS date, CAST(date_format('2021-12-16', 'u') AS int) AS dayofweek UNIOn ALL SELECT '2021-12-17' AS date, CAST(date_format('2021-12-17', 'u') AS int) AS dayofweek UNIOn ALL SELECT '2021-12-18' AS date, CAST(date_format('2021-12-18', 'u') AS int) AS dayofweek UNIOn ALL SELECT '2021-12-19' AS date, CAST(date_format('2021-12-19', 'u') AS int) AS dayofweek UNIOn ALL SELECT '2021-12-20' AS date, CAST(date_format('2021-12-20', 'u') AS int) AS dayofweek) t

    date_format轉換星期

    補充說明

    date_format函數(shù)如果第壹個參數(shù)是字符串,連接符只能是“-”,不能是斜線或者其他得。

    select date_format('2021-12-12', 'y');-- 2021select date_format('2021-12-12', 'yyyy');-- 2021select date_format('2021-12-12', 'yyyy-MM');-- 2021-12select date_format('2021-12-12 12:10:01', 'yyyy-MM');-- 2021-12select date_format('2021/12/12', 'y');-- NULL

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